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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376d424e03ed8610a39c0524674464482b96f3cf3f7fbf63934bc2747f5d545e' 
  AND token = 'NSpzTTpCS47rwxNlAQe2QXinhr/gx5dyb/3EWsOymzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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