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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9d70c9519c88a04ebc8d952536a8b2a25e0380c1959056595b216b9db9a42d' 
  AND token = 'ypaf3auRpoMR8jiG8yvoU9WNwyRCLeq5GrYmnaFCMd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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