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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4dad4d53c089172811d7d963a7f4fa90a61de218621996af0c76ecb185a3b0' 
  AND token = 'mQFeDb5iNYqYxmEgaeaa9BavxYzmJ7AM6fmoftlx+1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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