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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f832a8ab998dbf55f019d047ec8848b169db71804a9644b6aa93eaa4d9bb97f' 
  AND token = 'Hj0IK2UifwOvn0KcLPCO51TJVSjDMFp3PJrlCD8SGhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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