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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320e37c38a558c38f5e2f6f23efb259549342cf159258dbb986be63b4527dfd4' 
  AND token = 'wyqITA5uTo5ZLjGgZeXHAuQdXAaf+TnWMUwk5jajxbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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