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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b98113349cad647d30ee91ee0ba07f299169492a741dea6e07b75be6f495300' 
  AND token = 'Mw6HpyUm5ODE1FZBPveyAWjuRWE0AVQ40ZaWmz4PPD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}