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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83b29c4be1aef56dbcdf453893e3f84192f44d78e1d978013e93c10d142287e' 
  AND token = 'PniIA6Pep71ywTJfsE44V6Gr9jSiqPe9pwZXVO3aFvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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