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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0530a9accb9844c089c955ef117df9bd56b9fd5e091a94684af012f6fccbe34f' 
  AND token = 'vnO5sZnQ+4HOJRYRijea5mJwBBd3AzbZUB/+TXdpek4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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