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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01e5bf9eb89c1f78956d861925e7c2455819d5f8960a93884d74fa1715b67b1' 
  AND token = '/S8sJcMDbmSSK+q2u/n0qiESzDU4zCzVg1BxUMUK+SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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