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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f18d7a5990ca65d10a412f586057b372ef600bc82006352908fa67fc483aa88' 
  AND token = 'wrwl5MurmB4L1NgDERhf405gRpi/da9+NYD4GrDUl6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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