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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913f2aa7a40f4240db479926908bc63dee02016e5b51807b8464ddeb176b7607' 
  AND token = 'hW9hWsNvyW3dVsqHTTK6WQaVES6hIC+RQaK1Ha58n5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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