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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd62741cea7e75187f4c25928c07084ccb6af3a8699208ed89ad89aed5faa8b' 
  AND token = 'N0L5e/QDJfZ75jCtccVilxnIgGmh7XZ9FoCyYIUlK9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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