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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a948c92d10701bbdb52f1b3a16482fc9ea943a06eaa6b48ffc3d7ddc7fb8e2ca' 
  AND token = 'PrtRjJS4oNRZnxnMgX41mStkE1Ptu8bGdKOnh6a8Hdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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