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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f15d70ba8f435073e533f4231c005bd53d6e6aedb3e7c9d17732e1da61aacf' 
  AND token = 'WA5UkHQbX3aZDjTufakhuR9HunuAqX+XlDPLRC/UlgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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