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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a3eff4f01b9fa2dd67febeb1e8b9a060d99a6eee10fff6bc20b9dcf9ca949a' 
  AND token = 'FKtuIeEXnKkOu79ANKtmwXGyBLPejubyPgRskJVtGwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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