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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ee05ea573d3599ea82ccbf6fc40a8306f28f870a01bd6224fbede740c6e3bb' 
  AND token = 'ZjeDSGAKZc+poa+ytOMUXXAuPNJ9sWyRhcpMd61I54M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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