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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6767367bbede4e8566c40dd07e927ddcf247dcd96c979777709c44c41c1408a9' 
  AND token = 'l4SWONQa5gRpvgFA5it1SIyyveNP1uiuRmdxaq0Ojy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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