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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9a85f71b2cb9a23816ce4c0118b4bb56e1f5a6544be2dbffb75c776297ac33' 
  AND token = '8rJ5AwJm3EcDKmbFUYCa9pvdL5ttl/mkWb7PZlow+5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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