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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f3dba319c295ef0850d92493c3e88c07605f5b253166e4d2c13e00dd3a6fd8' 
  AND token = 'ghK263qnLKh39SWQRFa4iVxeEfRhkuOLeswn6GaBA4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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