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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82597c6b2748a694f17f27469516f3fc3b9f14e27703de35404049db63b0074' 
  AND token = 'CrLiDq27ogP7lk/QshSU8qiHf65MUnZkg0sWhhd85/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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