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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02392d1f129897f6232689b57f4816740348f44a7932887056ee5cd45bd34dfb' 
  AND token = 'Z4LnMQ6Xbv1QRRGWsd8NOZ/OvVsMoU+50g3lb+VHNX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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