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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff3af9e60ce5da8a15fb0eabf6312115e4496939d841a9e01dfb371e3a1d92e' 
  AND token = 'wGtax3SijYJfLiynEaa1cQzF9q+lpRcNTUQhp98N/b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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