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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9628444017b2ebdfc89b7c1339887432296aa49db6c26b483a035c04e304e8e9' 
  AND token = '7scKFrl5deYSTpJVDugdTQu0HwgmrS1V6ka81ioeDlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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