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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e71966017ca2c0194c530d1c32d7c070fa6c367ce676fd6e68512f7f3c2f7a' 
  AND token = '2isgYlmcqv4au/IdPiKBYd/Loj8woL4NVeP5/f1rvRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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