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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d396ecd3a8ae365d5274dbce171b1d514f8d4a0f6491b139c59516bd38943ba' 
  AND token = 'RA97z6KZ0fY2fbvkYFx4Y7CoHtO4Am5MMdz6J/AVxAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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