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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29e013a9ab0f8a788dec890067a302f69b76a3c2bfac278e3d2add8d3ef044f' 
  AND token = 'JGUm7fODCvIBgSFJFWv2EHFwmznkGJH4/ug0Z5/5nfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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