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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1c7cc7231e5e8431fcd4dcfd400f55e935ec9a9e5367bdd691b598ed0e9d7b' 
  AND token = 'TnoN6h/FTbFOQCuqKBQfXvIzCh/kHwmyPVOAfkG4TsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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