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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0467c02ecfdaa498cf02f93a6afc6f58e0d7038a997092d3b4110a3e3707d9c3' 
  AND token = 'm9yg/93EqxogxTJ7dOaT0iqB1m/EU+a8XuKRvfqoXYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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