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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952dd351c971267a3c40e0c8c74a254db90ca1c71cf0d8e5b1eab1879961abc9' 
  AND token = 'Sy4pTtJ/KwVZyclnXUC+8AjrwDHL7mv9y1NkkA9+PQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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