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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1efa0fbdbc9f18f93047d0fa92bedad7a4a3cad356a081d71ae1c51a165ecd4' 
  AND token = 'LaGVO87pjV9qXCn/oFZdoKcYkUIETE1RLEh34m+ObsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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