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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938111d4495c9b74103df4d446bd429d292bf9f119820fdd724ebebb2dbcf97a' 
  AND token = 'mOZfygZqYCPrKse7WhmGpDxWeMjEIafbbd3om/XaGaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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