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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051e4c0deba450c1a5935dd861e352eb84f27141a95453262db84b739e9f5657' 
  AND token = 'kTGnf2EH6g1rBaP5iIohB3GnVpem4A6IsURfZZFisiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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