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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb698f07252960800d2b67710f76cba3e936e96b66ce2cd78e15603de6513dbb' 
  AND token = '952yxYAfsy6nbR+c8HIEN5u/I5noph32dK5YL8Hv7FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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