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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe9c160888d0f53ed61a40ea76e6d778f71754ae04cb90122275d63dedaa787' 
  AND token = 'hBj21nBu6tZL/rne1zm4v6oMedLZ3469IkOt7zOt0Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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