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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58a8c5017a4b41bde152ec0cd0d1b79d8e2f09db4a4d28b5acaa0b3b2433dd4' 
  AND token = 'bicYZq/jBuJHFI97y0WBICO1gIbzS7tqeLmXlKrFjIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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