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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35f3c9ed3b5ed130b962edcb792b29c5e8e8e9c1af2f886402064ced4d1f1b9' 
  AND token = 'adINP6Yw5+AuKtHjVbvTIdjN5S7bjGXcku9juYHd9ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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