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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c3a5cef2a373e0ce49c8f0634529240da7178c44a564e8194470d6517a3b06' 
  AND token = 'T5x6R8qy3OjVz764vDY9VxTMMa5qUa/wxZhblQO2t0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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