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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1533ce2c55d678143c3fef46b02de4b9665d65afdf58f7ef48c66dfb68a8631' 
  AND token = 'nh2r18U80kcZnpF566E4LbyhX5Yqu4xnLTxKS0GFz/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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