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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11692c284b7683e076dd15133d47cec4e3efa538bdc7618b19f91b0ec90feae7' 
  AND token = 'p8IKIWa4wcoCH82tUdKry3p6dNEbh0BGMx/I3IygiTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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