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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352c5b60b790a93851679751586ad5f8d27679f4990afc311a1e1b1e3fdf5b85' 
  AND token = 'L+WfJxY84LSDKZA5ho9Mx7wSiyKh37Ebqxwc2JUqHJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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