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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7650e9bbc967b0073298f8948fea3b5abf89c1fdf59c2b7c1016b40176e50c19' 
  AND token = 'rRT7LSmlHgO+gTzbvqOI+oLkG/HlHWk2fvePHmnfHL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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