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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c025a4b8a845a3433fbe715bf29e78f5e828a87baa28259bff82cfe6d9d66a86' 
  AND token = '32Z7rIWuMRMAhj63GzwMeFvZrBCzRhiyrHzpyTO4qPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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