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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf7e993a294ceb4113ad935ed0afa19db79f666923c730acd3b3ff1eebae9d9' 
  AND token = 'JwdbCkGbPAg6QvYvS5aaxjNt2JTaQIFgX0bVZ5O/wt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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