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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feea42d104b9e37fb561a84915150c067567b21e4d7767dbd7440c247df739b5' 
  AND token = 'qgpawnipHAhA4j68AGp7SfIka9zMnu7JIfBH8BvWdnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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