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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2a892471a57d61350b0043c3a0258f7fbb3850761a7060c54dec01e1691360' 
  AND token = 'L3q+RAACdOO99PXPcSz1SDNrlngdfww7i/gYI9/UDic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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