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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2327c34d6fe909f3529af1cc56bb1ce1877141d8dd3c34a78d22c0a4f81806d9' 
  AND token = 'NULflHFZ4N177kREVX/5YHd70Soa2EEn1KG2LQRMehg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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