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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f52f91fe8553f8f216623a7fd93da9094d7997127ae3e1444a9da068711f9e' 
  AND token = 'Fk1M3a04m7LGB55F3EoniEOzsrlFjX3DpgLx6l5i//g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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