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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3dd65c6ce76af8ef9e5efa906b464eb7082f1e5bf94db4d0e8c24edd970501' 
  AND token = '8ixeflbtWwRgRvbKY4WrJydcdvNg74ezqGr7eWvqd8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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