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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd82b68ba5c467e8f942f74cc139ea3c51a7bb2c50ae18e93e209a4cbdc45fb7' 
  AND token = '2AlGuR2Vyovhl4uViCKDJxeSRO+qBNb9tc/h9t/4D9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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