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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b8888051e63d91c25f55b1f05cdf5550c6df25ee81bc489b2f84b0359987b7' 
  AND token = 'snYg+3jFbXX9W3hN6dGVIX4pqnllkDDDx1tahWi04dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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