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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59babb0d07f494926259b67c0660e7903b4be79ab2833dc32eb4d22ac49ec805' 
  AND token = 'q2oTaxazAEFEG3dF0f8U3R04YdI9TTDaJhVUAo8fFJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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