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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b37af68ae894beaf0621ce4cfb3fe11459a863976a00a9b8359e9e47d646a8' 
  AND token = '7zzltC4zMiFeSG7O1LrlrxYw4um9sxRqqjiZpmrx49k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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