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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81ae44de1b00714137c8b0ab24dcf74ce5e0e76a1acebb9f0e890fd7a447b7c' 
  AND token = 'yf4lA7sGigashedp2BRIKzkBE5C4hLPEvmzEsdeOXsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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