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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f44efe982a50065958c0b8e94cfa30a6e26658a4f8ccef6cc28bd1b033cc97' 
  AND token = 'Txm0KiGxDf59srmDjIL5f4BbEocLGJS9JQcAFdaffZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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