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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2ca04858ad01f9f8dd8d91b2b2c9a8b93b540cca6ebd3c9d8fa4bdf7caf9ac' 
  AND token = 'pIE8R+w6WdyfvK7HMwt2ebnvFJhOkhmUmuR5d/xYGqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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