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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee5bf00178cbf88c6fa9e3c6b4e9e46c1162a10cdd9a1e18b28bfc8fa3ecc5a' 
  AND token = 'lWowfZSAgDvH1wpA8iXYgKc1sqL6Fqz9MvMSmjVpXgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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