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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d0bda773859b01122c121bad0405ecc1ce679a745977d1943a50d49218aa5a' 
  AND token = 'iUc4DI2IDhenrHFEy/+YmyIYPitXL9TAWjH+glc8/nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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