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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49890dc5218d4bbdebea2024cce0612076eca38165fd716053140bb8183d9b8' 
  AND token = 'tSVI7ZBix4zWhOWy7F8qww6Szg8h2IKrHNcbeOeBj+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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