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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f32e9e41477830de13019e73476332595306a6b56e87b770f98241af9807dd' 
  AND token = 'R7/Ssd4uc/jcsjk2DuiqwUVcZOLHkm7dy3T/9DMMP6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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