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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e22b45af0af7a3148fcbb7c97c46599fb3a391a0f36bca37314a15b3d1eb0d' 
  AND token = 'pyZSUHe/R8LhjP+oLplKBazLEYlUWCb16vYeaUHuYLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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