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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d67c0d72cc9840895f8fc1188ad5d450a881d94c67b27b04987d0cdb024a730' 
  AND token = 'Fxn3pJgtAa/f0GQHxonZZvDXUdAAo3Aa1VDfFG3tfws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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