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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8be4fae4077236b98c77bd57b6f2484dbd75265d0b55e13540f11e3b8e7d70f' 
  AND token = 'rejzw9eIe/5sKwhnMBn9131s42ka/zboTEp4CRuCJa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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