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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28570f4abb9e7c0f9f105eb5bb40b43bd2d9c3eeaa491d2e2fc0b1344bf855b' 
  AND token = 'fW1S11mCaQtgNRsxIS7V4dxUg+UxkdzZqFmU7lMqFlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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