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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b3ea21f893d2ecd368d04086ea940766a3b538e20641688cee2737808721e5' 
  AND token = 'HlccMl/GVXa5PKokBv17DJzU9ryzLJS2LJSXUQT6uns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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